Various changes to reflect updates to this repo made with the 2.5 release.
Various changes to reflect updates to this repo made with the 2.5 release.

- No more start or angular-start branch references.
- Angular 2 --> Angular
- Updated contributors list

Fixes #214

NativeScript/sample-Groceries,poly-mer/community,NativeScript/sample-Groceries,tjvantoll/sample-Groceries,Icenium/nativescript-sample-groceries,NativeScript/sample-Groceries,tjvantoll/sample-Groceries,poly-mer/community,tjvantoll/sample-Groceries,poly-mer/community